Because no one cares? The BBC is there to provide a service to the public, if the public doesn't care about a court case why would there be lots of articles? There was lots of interest in the Johnny Depp case, not because people cared who was right and who was wrong but it was scandal and scandal is so popular there are lots of trashy news outlets that just handle scandal. While the Assange case is largely boring, we know he did X,Y,Z because he publically boasted about it, legally he is to be treated as he is innocent until found guilty but we know he did it because he said he did it repeatedy. We know these are crimes in the US. Now it's the boring details of can he be sent to the US which doesn't really affect people and rather hard to understand without putting a bit of effort into it. It's not light reading.